Even though Amy has been working at the store for almost two decades, she hasn’t had the easiest time handling her former co-workers becoming her subordinates and the challenges of running the store under a comically shady and somewhat abusive corporate structure.
I wouldn’t be surprised if dealing with these issues leads Amy to take another path and abandon her work at Cloud 9.
Amy was able to become store manager in Season 4, after not only getting some training from corporate and former store manager Glenn, but blackmailing their district manager Laurie, after Amy caught her snorting cocaine at work.